//适配兼容

(function(doc, win) {
	var docEle = doc.documentElement,
		
	resizeEvent = 'orientationchange' in window ? 'orientationchange' : 'resize';
	var recalCulate = function() {
		var width = docEle.clientWidth;
		docEle.style.fontSize = 100* (width /750) + 'px';
	};

	recalCulate();

	if (!doc.addEventListener) return;
	win.addEventListener(resizeEvent, recalCulate, false);
})(document, window);